Cats can eat zucchini safely in moderation. Zucchini is non-toxic to cats and can provide beneficial nutrients like vitamins A and C, fiber, antioxidants, magnesium, and potassium. It should be given plain, without seasoning, butter, or spices, and can be served cooked (steamed or baked) or raw if washed well. Zucchini can aid hydration, improve digestion, and help with weight management as it is low in calories. However, since cats are obligate carnivores, zucchini should only be a small supplement to their primarily meat-based diet. Introduce it gradually and observe for any adverse reactions.